We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
HONEYWELL HOME T4398A1021 Analog Thermostat, Heat Only, 50-80°F, 120-277V AC - Analog Thermostats
HONEYWELL HOMEAnalog Thermostats

HONEYWELL HOME T4398A1021 Analog Thermostat, Heat Only, 50-80°F, 120-277V AC

The HONEYWELL HOME Line Volt Mechanical Tstat: Heat Only (MPN T4398A1021) is an analog thermostat with a single-stage (1H) heat-only application. It features an exposed dial control, operates on 120 to 277V AC, and…

SKU 3G-OTH-70216

Brand
HONEYWELL HOME
Item
T4398A1021 Analog Thermostat, Heat Only, 50-80°F, 120-277V AC
Part Number
T4398A1021
Category
Analog Thermostats
Available to Order
Also known as:T4398A1021HONEYWELL HOME
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

HONEYWELL HOME
Manufacturer Part Number
T4398A1021
Type
On, 50° to 80°F, Exposed Dial
AC
120 to 277V
Stages
1H
Voltage
120 to 277V AC
Application
Heat Only
Control Type
Exposed Dial
Fan Settings
No Fan Setting
System Settings
On
Switch Type/Action
SPST, Open on Rise
Temperature Control Range
50° to 80°F

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

HONEYWELL HOME Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HONEYWELL HOME Line Volt Mechanical Tstat: Heat Only (MPN T4398A1021) is an analog thermostat with a single-stage (1H) heat-only application. It features an exposed dial control, operates on 120 to 277V AC, and uses a SPST switch that opens on rise. The temperature control range is 50° to 80°F, with system settings set to On and no fan setting.

Frequently Asked Questions

What is the Honeywell Home T4398A1021 line volt mechanical thermostat used for?

The Honeywell Home T4398A1021 is a heat-only analog thermostat for single-stage heating systems. It controls temperatures from 50° to 80°F using an exposed dial, operates on 120 to 277V AC, and features a SPST switch that opens on rise. Common in industrial and commercial heating applications.

What are the specifications of the Honeywell Home T4398A1021 thermostat?

The Honeywell Home T4398A1021 is a line volt mechanical thermostat with heat-only application, 1H stage, SPST switch (open on rise), temperature range 50° to 80°F, voltage 120 to 277V AC, exposed dial control, and no fan setting. It is an analog thermostat for simple on/off heating control.

Where to buy the Honeywell Home T4398A1021 thermostat worldwide?

3G Electric supplies the Honeywell Home T4398A1021 thermostat to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery for international orders. Contact us for pricing and lead time on this heat-only line volt mechanical thermostat.

How to install the Honeywell Home T4398A1021 line volt thermostat?

Install the Honeywell Home T4398A1021 by disconnecting power at the breaker, then wiring the SPST switch (open on rise) per the heating equipment schematic. Mount the exposed dial thermostat on a wall away from drafts. Set the temperature between 50° and 80°F. Always follow local electrical codes.

Used in

Common applications for HONEYWELL HOME
Residential HVAC — Honeywell Home TH115-A-120S/U thermostat for 7-day programmable temperature control in homes.
Light commercial buildings — Honeywell Home TL8230A1003 line-voltage thermostat for electric heating systems in offices.
Hydronic heating systems — Honeywell Home L4006E1117 immersion controller for high-limit temperature regulation in boilers.
Indoor air quality monitoring — Honeywell Home C7263A1008 air quality sensor for gas analysis in commercial facilities.
Furnace control — Honeywell Home ST9120U1011 timer controller for circulating fan timing in integrated furnace systems.
HVAC switching — Honeywell Home RA889A1001 switching relay for 24V AC control of zone valves or dampers.
Not sure this is the right part? Photo-identify it

HONEYWELL HOME Products

3G Electric supplies HONEYWELL HOME analog thermostats. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

More from HONEYWELL HOME

View all HONEYWELL HOME parts
Analog thermostat for heat-only control of single-stage heating systems. Features a dial control with a one-piece vented cover and SPST switch action. Operates at 120, 208, 240, or 277 volts AC. Temperature range 40 to 80 degrees Fahrenheit
HONEYWELL HOME
Analog thermostat for heat-only control of single-stage heating systems. Features a dial control with a one-piece vented cover and SPST switch action. Operates at 120, 208, 240, or 277 volts AC. Temperature range 40 to 80 degrees Fahrenheit

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first